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RC Snubber Circuit for Thyristor Power Control and Transient Suppression

2017-12-21
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RC networks are used to control voltage transients that could falsely turn on a thyristor. Such networks are called snubbers. A simple snubber consists of a series resistor and capacitor placed around the thyristor. These components, along with the load inductance, form a series CRL circuit. The basis of snubber theory is the solution of differential equations for the circuit. Many RC combinations provide acceptable performance. However, if the snubber is used incorrectly, it can cause unstable circuit operation and damage the semiconductor device. For reliability reasons, both turn-on and turn-off protection may be required. Sometimes, the thyristor must operate over a certain load range. The type of thyristor used, the circuit configuration, and the load characteristics all have an impact. There are trade-offs in snubber design. These trade-offs include cost, voltage rating, peak voltage, and turn-on stress. The actual solution depends on the physical characteristics of the device and circuit.

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